User equipment performing beam reporting

Abstract

A user equipment (UE) includes a receiver that receives, from a base station (B S), multiple reference signals transmitted using first beams, a processor, and a transmitter. The first beams comprise at least one second beam used for Physical Downlink Control Channel (PDCCH) transmission between the BS and the UE and third beams that are not used for the PDCCH transmission. The processor measures quality of the first beams. The transmitter reports, to the BS, the quality of the at least one second beam and part of the third beams.

What is claimed is: 
     
         1 . A user equipment (UE) comprising:
 a receiver that receives, from a base station (BS), multiple reference signals transmitted using first beams, wherein the first beams comprise at least one second beam used for Physical Downlink Control Channel (PDCCH) transmission between the BS and the UE and third beams that are not used for the PDCCH transmission;   a processor that measures quality of the first beams; and   a transmitter that reports, to the BS, the quality of the at least one second beam and part of the third beams.   
     
     
         2 . The UE according to  claim 1 ,
 wherein the first beams are used for transmission from the BS,   wherein the receiver receives the reference signals using fourth beams used for reception at the UE, and   wherein the processor measures the quality in each of pairs of the first beams and the fourth beams.   
     
     
         3 . The UE according to  claim 2 ,
 wherein the fourth beams comprise at least one fifth beam used for the PDCCH transmission and sixth beams that are not used for the PDCCH transmission, and   wherein the transmitter reports:
 quality of each of pairs of the at least one second beam and the at least one fifth beam; and 
 quality of part of pairs of the third beams and the sixth beams. 
   
     
     
         4 . The UE according to  claim 1 , wherein the quality of the part of third beams is higher than quality of beams other than the part of the third beams. 
     
     
         5 . The UE according to  claim 1 , wherein the quality is Reference Signal Received Power (RSRP). 
     
     
         6 . The UE according to  claim 1 , wherein the transmitter reports the quality and a beam index that identifies each of the at least one second beam and the part of third beams. 
     
     
         7 . The UE according to  claim 1 , wherein the transmitter reports the quality that is represented as a differential value from a quality value of the at least one second beam. 
     
     
         8 . The UE according to  claim 1 , wherein the quality of the part of third beams is greater than or equal to a predetermined threshold value. 
     
     
         9 . The UE according to  claim 8 , the predetermined threshold value is a lowest quality value of the at least one second beam. 
     
     
         10 . A user equipment (UE) comprising:
 a receiver that receives, from a base station (BS), multiple reference signals transmitted using first beams, wherein the first beams comprise at least one second beam used for Physical Downlink Control Channel (PDCCH) transmission between the BS and the UE and third beams that are not used for the PDCCH transmission;   a processor that measures quality of the first beams; and   a transmitter that reports, to the BS, the quality of part of the third beams.   
     
     
         11 . The UE according to  claim 10 ,
 wherein the first beams are used for transmission from the BS,   wherein the receiver receives the reference signals using fourth beams used for reception at the UE, and   wherein the processor measures the quality in each of pairs of the first beams and the fourth beams.   
     
     
         12 . The UE according to  claim 11 ,
 wherein the fourth beams comprise at least one fifth beam used for the PDCCH transmission and sixth beams that are not used for the PDCCH transmission, and   wherein the transmitter reports quality of part of pairs of the third beams and the sixth beams.   
     
     
         13 . The UE according to  claim 10 , wherein the quality of the part of third beams is higher than quality of beams other than the part of the third beams. 
     
     
         14 . The UE according to  claim 10 , wherein the quality is Reference Signal Received Power (RSRP). 
     
     
         15 . The UE according to  claim 10 , wherein the transmitter reports the quality and a beam index that identifies each of the part of third beams. 
     
     
         16 . The UE according to  claim 10 , wherein the quality of the part of third beams is greater than or equal to a predetermined threshold value. 
     
     
         17 . The UE according to  claim 16 , the predetermined threshold value is a lowest quality value of the at least one second beam.